-
Preheat oven to 400 degrees. Lightly butter a 3-quart baking dish; set aside.
-
Cook pasta in boiling salted water according to package directions; drain.
-
Melt butter in a large saucepan over medium heat. Whisk in flour and cook for 1 minute, whisking constantly.
-
Whisk in milk and crema, continue cooking whisking constantly for 6 minutes or until mixture is slightly thickened.
-
Stir in diced tomatoes, salt, and pepper and continue to cook for an additional 2 minutes.
-
Remove from heat and whisk in cheese until smooth. Stir in cooked pasta, then spoon mac and cheese into prepared baking dish.
-
In a bowl combine cilantro, crushed tortilla chips and melted butter. Sprinkle over pasta.
-
Bake for 15 minutes. Serve warm.